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He wrote on Facebook (May 28): "The police are digging and raking through what's been called a "cell" or large area.

Police, with Martin McKeague, as they continue the search for missing RAF serviceman Corrie McKeague at Milton landfill site (Image: Geoff Robinson Photography)

"That cell area has been identified through numerous conversations and extensive information gathering efforts with the site's owners and operators, and it is the area of highest likelihood where we will find Corrie in the landfill site.

"At present the police have searched approximately half of that cell's total area, and that search has now been extended into beyond that primary search area."

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He added: "These volunteers from the Norfolk and Suffolk police forces have literally moved heaven and earth for our family - 4,050 tons of it to be exact.

Picture shows the police as they continue the search for missing RAF serviceman Corrie McKeague at Milton landfill site on Wednesday, March 15.

"It is our strong opinion - and one that's shared by the entire McKeague family in Scotland - that thanking these unbelievably dedicated people face-to-face for what they're doing in what is an horrific environment and (this week in particular) scorching heat, is the very least we can do."

Martin, who lives near the site in a camper van, remains convinced officers will find his son there.

He added: "The reason the police are searching the landfill site now is because there is hard evidence to suggest that they will find my son there."